baville



I (No Model.) 4 Sheets-Sheet 2.' E. P. BAVILLE.

SCREW CUTTING MACHINE. No. 361,572. Patented Apr. 19, 1887.

(No Model.) 4 Sheets-Sheet 3. E. P. BAVILLE. SCREW CUTTING MACHINE.

N. PETERS Phulwmlmgnpher, Walhinglom ma 4 Sheets-Sheet 4.

(No Model.)

- E. P. BAVILLE.

SCREW CUTTING MACHINE.

Patented Apr. 19

N,- PETERS, Pholu-mhu n her. wmhingmn, n. C.

UNITED STATES PATENT OFFI E.

EDMOND P. BAVILLE, OF BRUSSELS, BELGIUM, ASSIGNOR TO J ULIEN PONTY, OFSAME PLACE, AND HENRY HOWARD, OF COVENTRY, R. I.

SCREW-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 361,572, dated April19, 1857.

Application filed October 27, 1886. Serial No. M1320. (No model.)

To all whom, it may concern:

Be it known that I, EDMOND PIERRE BA- VILLE, engineer, residing atBrussels, in the Kingdom of Belgium, have invented new and usefulImprovements in Machines for Threading Screws, (for which no patent hasbeen obtained in any country) of which the following is a specification.

The dies and die-stocks which form the sub- 1c ject of this inventionall belong to that kind of dies in which each cutter consists of asimple bar or piece of steel grooved on the face to suit the thread tobe cut, the cutter being placed tangentially to the blank in atoolholder adjustable in the die-stock, by means hereinafter described,and shown in the annexed drawings, of which Sheet I shows a die'stock tobe worked by hand. Sheet II shows a die-stock suitable for ordinarythreading-machines, with means of disengaging by hand. Sheets III and IVshow the same die-stock with means for automatic disengagement andmechanism for cutting conical screws.

In Sheet I, Figure l is a front view of the die-stock with the cover 0and circular rack removed. Fig. 2 is a side view, partlyin section, andFig. 3 is an axial section,of said dicstook. In Figs. 1 and 2 the armsare shown broken off.

In Sheet II, Fig. 4 is a front elevation; Fig. 5 is an axial section,andFig. 6 is an edge view, partly in section,of the die-stock with handmechanism for retracting the cutters. v Fig. 7 shows a face and an endview of the cutter. In Figs. 4 and 5 the die-stock is mounted to slideas in an ordinary screw-threading machine, while in Fig. Git is arrangedwith eyes to slide along rods.

In Sheets III and 1V, Fig. 8 is a front View of the die-stock with theautomatic disengaging mechanism, the handle,and part of the rodappearing broken. Fig. 9 is a view of the upper side, partly in section,the guide-rods and handle appearing broken. Fig. 10 is an axial sectionshowing in dotted lines the wedgeshaped plate'for retractingthe dies forforming conical screws. Fig. 11 is a view of part of the disengaging andother mechanism hereinafter referred to.

Thehand-stock, Sheet I, consists,essentiall y,

of a ring, A, which is perfectly circular outside, but from whichproject toward the interior radially,and at one-hundred and twentydegreesapart,threebosses,D,ofsuitablelength. In these bosses D are thenuts E of the tool- 'holders, which are fixed directlyv andperpendicularly to the backs of the holders P,fron1 the inner ends ofwhich shoulders cproject at acute angles, against which rest the cuttersB, whose ends are ground to this angle at the outer end. The holder 1?is bent at right angles and slides on astraight face, d, of the ring A,which in this place has through it a slot, 0, suficien't for the passageof the setting-screw 1:,which clamps the cutter in the holder. In thenuts E of the holders, screws V are caused to turn by their pinions Q,being prevented from moving lengthwise, because the plate p embraces theshank 0 between the pinions Q and the shoulder r, the plate 1) beingitself fixed in a dovetail in the ring A.

The bottonrf of the ring A has through it a central hole for the passageof the blank T that is to be threaded. On the other side of the ring Ais placed a circular rack, O, which gears with the pinions Q and can beturned freely by one of those pinions, being held in position in a chaseor annular groove formed in the inner face of a ring, 0, which is fixedby screws V to the body of the stock. The ring A is provided withscrew-threaded studs S, on which are secured pipes of suitable length tosecure an arm, S. (Shown in the drawings broken off.)

Now, if all the cutters are equally distant from the center, (which canbe verified by introducing a blank, T,) it maybe readily seen that ifone of the pinions Q be turnedin the one direction or the other all thecutters will approach toward or recede from the center to an equalextent, because all the pinions receive from the circular rack O thesame rotary motion, causing the screws V to turn in the same manner inthe nuts E, which advance or retire in consequence. For this purpose oneof the pinions Q is provided with a squared head, to which a suitablekey is applied.

In the stock shown in Sheet II, Figs. 4, 5, and 6, the mechanism formoving the toolholders, though based on the same principle, is differentin construction. This kind of the blank. through which pass guide-boltsA A A,

'ters and thus stop their action.

stock is chiefly intended to be fixed in the middle of a slide or on arunner, so as to be moved by the rotating bolt. This stock isdistinguished from all now in .use by the arrangement of thetool-holders A A A which are not wholly within the body of the stock,but on the contrary project from the front face of it. v Thetool-holders have attheir' bases dovetailed guides B, at right angles tothe cutters B, which slide in corresponding grooves formed in the faceof the stock. The middle lines of these guides are radial, so that thecutters B can always be placed tangentially to The tool-holders alsohave slots to,

screwed in the body X of the stock, so that the pressure on the guidesis relieved by those bolts. The tool-holders have end shoulders, e ande, between which the cutters are fixed by the screws '0, as in the formof the device already described. The adjustment of the tool-holders iseffected by the screws V, with beveled pinions Q, which are radiallymounted in suitable cavities formed in the body X of the stock. Thescrews V work in screw-. threaded lugs E on the dovetailed guides B,these lugs being free to move in the cavities in which the screws V aresituated. Each screw V has at one end a small pivot, m, entering thenave X of the stock, and at its other end it is held in position by aring, A", which in the present case, Figs. 4 and 5, forms part of thesupport in which the stock is held. With the pinions Q, of the screws Vengages the circular rack O, which turns on the nave X of the stock onturning the handle M, the eye of which, M, is fixed on the rack G byscrews 10', so that the tools are advanced or retracted according as therack is turned in one direction or the other.

In order to keep the tools always equally distant from the center, aregulating-screwm, passes through a lug and serves as a stop for, thehandle M. The handle remains in this position as long as the blank isbeing cut, and when it is cut to the desiredlength the handle M isturned back ward, so as to retract the cut- The rack O is held inposition by the ring E, which is screwed on the end of the nave X. Thedescribed arrangement of the tool-holders gives not only to them, butalso to the whole stock, great strength and solidity, because the bodyof the stock is much less hollowed out than in existing stocks,and isconsequently more rigid. The cuttings are also more easily cleared off,and there is no difficulty in lubricating.

The means employed in this form of the device for advancing andretracting the cutters is substantially the same as that employed by mefor advancing and retracting the grippingjaws of a chuck, for which Ihave filed an application of even date herewith. Whatever features thedevice herein described possesses in common with the said chuck are notherein claimed, but are claimed in the other application referred to.

The Sheets III and 1V represent a similar stock mounted on a machinewith slide-rodst and combined with automatic disengaging mechanism,Figs. 8, 9, 10, 11. In this case the circular rack 0, instead of beingprovided with a lever, M, is toothed at its periphery, as shown in thepart View, Fig. 11, and with it gears a toothed sector, Z, which ispivoted at a on an arm cast on the sliding crosshead G, Fig. 8. XVhenthe sector is in the position indicated by the full lines, the cuttersare retracted, whereas when it is in the dotted position the cutters areclosed on the blank. Opposite the sector, at a suitable inclination,extends an arm, H, consisting of a round rod inserted in asleeve, H, inwhich it can slide longitudinally. The sleeve H has at its opposite enda fork with eyes h, which are jointed to a slide, it, through a hole, in

which passes a vertical rod, Y, on which h can slide up or down. In thismanner the arm H of the sector can follow the movements of the slide hon the rod Ythat is to say, can allow for lengthening or shortening,according to the positions of the sector. The upper end of the rod Y isbolted to abracket, g, of the sliding cross-head, and it is surroundedby a strong helical spring, R, which bears at the top against a washer,1', which bears on the slide h, and at the bottom against a nut, r,screwed on the end of the rod Y, so that by it the spring R can be moreor less compressed to give it greater or less force. To alug, g, oncross-head G, Fig. 10,is jointed the lever L with shoulder Z, which canengage the edge of the sleeve H when it is pushed down to the dottedposition, the cutters being then closed in. It is held in this positionby thespring r, surrounding a horizontal rod, 11 between a collar, W, onthat rod and the rod Y, through which it passes to join at its ends withthe end of the lever L.

It may be readily seen that so long as the shoulder [keeps thesleeve-lever H down, the cutters remain closed in on the blank; but asit draws the stock along the slide-rods t t, the end of y approaches astop, y, and when y meets y the shoulder lot the lever L is disengagedfrom the slide h, and the arm B, urged by the'spring R, ascends, turnsthe sector Z, and thereby turns the circular rack O, which acts on thepinions Q, withdrawing the cutters from contact with the blank, andthereby stopping the threading operation.

\Vhen threading a cylindrical screw, the cutters must beineapable ofmovement toward or from the center of the blank; but it may be readilyunderstood that in order to cut conical screws the cutters should beregularly retracted or advanced, according as they are traversing thecone from apex to base, or vice versa. This movement is obtained in avery simple manner, and the length of the screw is fixed by aid of asleeve, 0, secured on the slide-rod t by setting-screw o, in whichsleeve is firmly fixed an angle blade or plate, (1 which passes abovethe slide 71. through a slot in the rod Y and pushes down the slide h,thereby closing inthe cutters.

The blade 0 being placed behind the stock, the stock in advancingwithdraws from the blade, and this allows the slide H gradually toascend, retracting the cutters along the taper screw until the blade isquite clear of the slot, whereupon the cutters are completely retracted.Obviously, if the blade 0 were located in the front of the stock, thecutters would be gradually advanced in the manner already intimated,instead of being retracted. IVhen the blade 0 is used, the lever L maybe dismounted, or vice versa, to prevent interference.

Figs. 9 and 11 show the arrangements for changing diameter. Forthis-purpose the nave X- of the stock is toothed as a worm-wheel, withwhich gears the worm IV. (Shown in end elevation in Fig. 9 and in sideelevation in Fig. 11.) The worm is lodged its whole length in a hollowof the angle piece or block 0*, in which it can be turned by a keyapplied to the squared head of its stem S. The worm WV, the anglepieceC, and a counter-wedge, G are lodged in a hollow of the slidingcrosshead, in which the whole is held by the screw 29, which screws intothe counter wedge. NVhen this is screwed up, the whole is firmly fixed;but when the wedge is loosened the worm can be turned, causing the bodyX of the stock, togetherwith the pinions Q, to turn around relatively tothe circular rack 0, thus advancing or retracting the cutters. WVhenthese are set to the desired position, the wedge (3 is again tightened,and the whole remains fixed in position. This mechanism is thereforequite independent of that for withdrawing the cutters at the end of thethreading operation. Fig. 7 shows a specimen of a cutter removed.

In Fig.8 M is a handle for withdrawing the die when the screw isfinished.

Having thus described my invention, the following is what I claim as newtherein and desire to secure by Letters Patent 1. In a diestock, thecombination, with the tool-holders secured to the external face of theframe by dovetailed guides and grooves and screws for moving saidholders, of the guide-slots cut in said holders parallel to the screwswhich respectively advance them and the guide-bolts extending throughsaid slots and into the body of the stock, substantially as set forth.

2. The combination, with a die-stock having radial screws for advancingand retracting the tool-holders and a circular rack engaging saidpinions and having teeth on its periphery, of

a toothed sector engaging said peripheral teeth and operated byengagement with a fixed part of the frame, substantially as and for thepurpose set forth.

3. The combination, with the dies, the means for advancing andretracting them, and the ring 0, having teeth on its periphery, of thesector engaging said teeth, a spring for holding said sector normally atone extremity of its permitted movement, a detent for holding it at theother extremity in opposition to the force of said spring, and afixedstop for tripping said detent, substantially as and for the purpose setforth.

4. The combination, with a die-stock having a ring, 0, with teeth on itsperiphery, and a I sector engaging said teeth and having the arm H, ofthe socket H, the rod Y, on which said socket slides, the spring R, forholding said socket and arm at one extremity of its permitted movement,the hinged arm L, having shoulder Z, for holding said socket at theother extremity of its movement in opposition to the force of the springR, and the fixed stop y, for tripping said arm L, substantially as setforth.

5. In a die-stock, the combination, with the ring 0, having teeth andthe sector engaging said teeth and having the arm H extending therefrom,of the detent L Z, for holding said arm at one extremity of itspermitted movement,and a spring for moving it to the other, a spring forholding said triplever normally in engaging position, and a stop fortripping it, substantially as set forth.

6. The combination, with a die-stock having the toothed ring 0, for thepurpose set forth,

and a sector engaging therewith and having the arm H, of the platehaving inclined edge for moving said arm from one extremity of itspermitted m ovement to the other, substantially as set forth.

7. In a diestock, the combination, with a toothed ring, 0, and a sectorengaging therewith, for the purpose set forth, and having an armextending therefrom, of a spring for holding said arm, normally at oneextremity of its permitted movement and an incline for moving said armin opposition to the force exerted by said spring, substantially as andfor the purpose set forth.

In testimony whereof I have hereunto set my hand this 30th day ofSeptember, 1886.

EDMOND P. BAVILLE- \Vitnesses:

AUG. JonRIssnN, LE on DOOQUIER.

